... Most of the water we use (3 ) ______. from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again. One of the (4 ) ______ ... Most of the water we use (3 ) ______. from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again. One of the (4 ) ______ ... the water we use (8 ) ______. from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again. One of the (9 ) ______ about...